Seth Gilliam (born November 5, 1968) is an American actor. He is known for his HBO television roles, first as corrections officer-turned-prisoner Clayton Hughes on Oz, and later as Baltimore police detective promoted to sergeant Ellis Carver on The Wire. On both of these series, he co-starred with Lance Reddick and J.D. Williams. His feature film credits include Private Sugar Watkins in the 1997 action movie Starship Troopers. Gilliam also had a recurring role during the seventh season of The Cosby Show as Aaron Dexter, boyfriend of Erika Alexander's Pam, and appeared in the 18th episode of the seventh season of CSI: Miami ("Flight Risk").